Metallic rod-packing.



EUGENE A. BRYANT, OF MINNEAPOLIS, MINNESOTA.

METALLIC ROD PACl (ING.

Specification of Letters Patent.

ratentect May 7, 1907.

Apnlicaticn filed July 23, 1906. Serial No. 327,455.

To u/ll/ Ill/ 7107771 it may concern/.-

Be it known that I, EUGENE A. BRYANT, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented a new and useful Metallic Rodl?acking, of whichthe following is a specification.

This invention relates to a shaft packing for preventing fluid underpressure from escaping around the shaft where the same passes through awall, and it has for one of its objects to provide a metallic packing ofsimple, inexpensive and improved construction which will effectivelyprevent leakage of fluid.

A further object is the provision of a packing of this character whichconsists of few parts so that the cost of maintenance will be reduced toa minimum and so that repair and renewal can be effected with greatfacility and economy.

l Vith these objects in View, and others, as will appear as the natureof the invention is better understood, the invention comprises thevarious novel features of construction and arrangement of partsdescribed hereinafter and set forth with particularity in the claimsappended hereto.

In the accompanying drawing, which illustrates certain of theembodiments of the invention, Figure 1 is a longitudinal section of astuffing box with the improved packing applied thereto, the latter beingshown partly in section and partly in elevation. Fig. 2- is a transversesect-ion of the packing. Fig. 3 is a perspective view of a cage orholder for the packing segments of one of the sections of the packingand the casing therefor. FlgS. 4 and 5 are fragmentary sectional viewsof modifications.

Corresponding parts in the several figures are indicated throughout bysimilar characters of reference.

Referring to the drawing, 1 designates a packing box which may be of anyordinary or preferred construction, as desired, having the gland 2 andreceiving the reciprocating shaft 3. The packing for the shaft may bemade of one, two, or more sections, as de sired, two sections, as shownin the present instance, being preferable for some cases.

Each section of the packing comprises a cylindrical casing 4,preferably, though not necessarily, made in one piece with its endscarefully finished in a transverse plane so that the casing of onesection will snugly fit the casing of the other and the outer ends willengage, respectively, the bottom of the stuffing box and the gland.Within the easing 4 is arranged a cage or frame-like holder 5 whichcomprises a circular collar that fits within the casing 4 and isarranged flush with one end thereof. Extending in an axial directionfrom one side of the collar 6 are spaced fingers or separatmg members 7which also engage the inner cylindrical wall of the casing and arepreferably formed integral with the collar. The cage or holder 5 may besecured in the casing in any suitable manner, as by means of thecountersunk screws 8. The cage thus divides the easing into a pluralityof radially extending pockets or compartments 9, the walls of each ofwhich are preferably parallel, this being accomplished by making each ofthe spacing members 7 sector-shaped in cross section.

In each of the radial pockets 9 is a segment 10 of any desired material,the inner surface thereof being arc-shaped so as to fit snugly on theshaft 3. The axial length of the segments may be varied, as desired. Asshown in 11 igs. 2 and 3, the converging surfaces of each of theseparating members meets in a sharp edge, as indicated at 11, so thatthe two segments of adjacent pockets are arranged in extremely closeproximity, so that the segments extend practically around the entiresurface of the shaft. I

In order to constantly maintain the segments in contact with the shaftand to compensate for wear of the former, a spring is employed for eachsegment. The spring may be formed as a spiral, as shown in fig. 1, or asan arched leaf spring 12, as shown in big. 4, each spring being arrangedin a segment pocket and disposed between the segment and the casing i.To effect the proper frictional engagement between the segments and theshaft, and to adjust the segments from time to time to take up the wear,an adjusting screw 13 is provided that engages in a tapped opening overeach spring in the casing 4, as indicated at 14. in the constructionshown in i1 ig. 1, the outer end of the helical compression spring 15 ofeach segment abuts at one end its respective adjusting screw and at theother end its segment. In Fig. 4, the inner end of the screw foradjusting each segment abut the center of the arched spring of thelatter. By either of these constructions, the tension of the spring canbe increased or diminished by turning the screw in or out.

The collar 6 of the segment holder is slightly larger in diameter thanthe shaft, so as not to bear on the latter and thus be worn away. Thewear is adapted to be taken by wearing plates 16 that are preferablymade in segments and seat in a counterbore 17 of the collar, the platesbeing made segmental so as to facilitate renewal or repair withouthaving to take the packing sections entirely off the shaft, as will bereadily understood. .I/Vith a packing thus constructed,

it will be seen that the parts that are sub ject to wear consist of thepacking segments and the plates 16, both of which members are ofextremely simple and inexpensive construction.

In assembling the two sections of the packing, it is preferable toarrange the sections so that the free ends of the fingers or separatingmembers 7 of one section will engage the inner ends of the packingsegments of the other section, as clearly shown by the broken awayportion of the left hand section, indicated at 17. .To facilitate this,a centering pin 19 is arranged in one section and is adapted to engagein a socket 19 of the other section. By so arranging the sections, the

joints between the segments of one section are staggered with respectto'the joints between the segments of the other section, thuseffectively preventing leakage along the shaft.

Referring to the modified construction shown in big. 5, each segment iscomposed of two oppositely disposed wedge shaped parts 20, the upper onebeing adapted to be urged in a longitudinal direction so as to maintainthe lower, or inner part, in effective contact with the shafts. Toimpart this longitudinal movement to the upper part of the segment, anysuitable device may be employed, as, for instance, a compression spring21 arranged in each pocket of the cage and bearing against the bottomwall of the pocket and the adjacent end of the movable part of thesegment. In this arrangement, the spring is given the initial tension bythe two sections of the packing being compressed together during theseating of the gland of the packing box.

I have described the principle of operation of the invention, togetherwith the apparatus which I now consider to be the best embodimentthereof, but I desire to have it under stood that the apparatus shown.is merely illustrative, and that various changes may be made, whendesired, as are within the scope of the invention.

What is claimed is 1. A packing comprising a casing, a pair of membersmounted in the casing and provided with a plurality of spaced sockets,the

sockets of one member being in staggered re latiop to those of the othermember, a p1urality o nally-of the pockets, and means for locking themembers together to preserve the staggered relation of the packingsegments.

packing segments extending longitudi- 2. A packing comprising a casing,a holder I snugly fitting in the casing formed of a collar,

and a plurality of spaced axially extending separating members, radiallymovable packng segments d sposed between the separatng members, andadjustable springs for'urging the packing segments inwardly.

3. A packing comprising a casing, a holder mounted in the casing andformed with a collar fitted flush in the casing and having spacedaxially extending separating members, and

casing, a cage fitted in the casing, means carried by the casing forsecuring the cage therein and preventingrelative rotation, packingsegments arranged within the cage and held from longitudinal and rotarymotion thereby, and adjustable means carried by the casing for eachsegment; and means engaging two adjacent sections forpreventing relativerotation and holding the cage of one section in .engagement with thesegments of the adjacent section.

6. A packing comprising a casing, a holder mounted in the casing andformed with a col lar fitted flush in the casing and having spacedaxially extending separating members, radially adjustable packingsegments disposed between the fingers, and wearing plates carried by theholder.

7. In a packing, the combination of a cylindrical casing, a holderfitted therein and. comprising a collar and integral spacing fingersextending therefrom, and screws for positively holding the cylinder andholder together.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses:

EUGENE A. BRYANT.

Witnesses HARRY S. SwENsEN, ETTA E. BoHARsoN.

